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A series of electrically heated circular tube experiments was conducted to investigate the influences of physical factors to supercritical RP-3 thermal oxidation coking. The flowing RP-3 kerosene is stressed from 3 to 7 MPa and heated to different bulk temperatures below 450 °C in a stainless tube (1.8 mm inner diameter and 2.2 mm outer diameter, 1Cr18Ni9Ti) with various heat fluxes. Tube surface and liquid-space coking were both collected and weighed using different methods to evaluate the coking characteristics. Besides, some test tube coking compositions were analyzed for the future investigation of chemical reactions. The experimental results show that the fuel temperature is a generated dominant influence factor for tube RP-3 coking, and its influence is greater than the wall temperature. The system pressure has no obvious effect for RP-3 with a high distillation range (C9–C12), and the wall coking quantity also gradually increases with the mass velocity. The average coking rate is proportional to Re in. Moreover, the inlet temperature has little effect on the liquid-space coking, and the coking particles basically have no threat to the fuel path and nozzle.

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